Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

Hopping Around the Array

data structures, dp

Communism

bitmasks, dp, trees

Summer Reading

dp, greedy

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Palindromic Hamiltonian Path

brute force, dfs and similar, dp, graphs, hashing

A Trance of Nightfall

dp, geometry, matrices, probabilities

Doping

combinatorics, dp, math

Happy Cactus

dp

Slalom

data structures, dp, sortings

The Third Grace

data structures, dp

Combining Slimes

dp, math, matrices, probabilities

Another Meme Problem

dp

Counting Skyscrapers

dp, math, probabilities

World Evil

dp, flows

Landmarks

data structures, dp

Deja Vu

constructive algorithms, dp

Caramel Clouds

data structures, dp, sortings

Cubes

data structures, dp, geometry, two pointers

Palindromic Doubles

*special problem, data structures, dp

Unique Strings

combinatorics, dp, math

Old Mobile

combinatorics, dp, probabilities

Thanos Snap

binary search, dp, games, greedy, trees

Codeforces Scoreboard

binary search, data structures, dp, geometry

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Anti-median (Easy Version)

dp, math

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Sequence Transformation

brute force, data structures, dp, implementation, math

Stairs

combinatorics, divide and conquer, dp, fft, math

Cactus to Tree

dp, graphs, trees

School Clubs

dp, fft, math, number theory, probabilities

Kojiro and Furrari

dp, greedy

A Preponderant Reunion

constructive algorithms, dp

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Kotlinforces

*special problem, constructive algorithms, dp

Maximum Sum Subarrays

*special problem, dp

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Poachers

dp, games, graphs, trees

Jumping Transformers

dp

Game of AI (easy version)

combinatorics, constructive algorithms, dp, fft, math

Code Lock

bitmasks, dp

Sloth

dfs and similar, dp, graph matchings, trees

Tree and Table

dfs and similar, dp, implementation, trees

Bitwise Magic

dp, math

Conference Problem

dp

Mini Metro

dp

Hellish Constraints

brute force, dp, two pointers

Stock Trading

dp

Mrs. Hudson's Pancakes

brute force, dp

Minimal Subset Difference

dp

Jellyfish and OEIS

dp

Mateusz and Escape Room

dp

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

Passports

dp, implementation

Byteland coins

combinatorics, dp, math

Bob and stages

dp, geometry

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

Turing's Award

data structures, dp

New Year Cactus

dp

Number Deletion Game

*special problem, dp, games, greedy

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

R3D3’s Summer Adventure

dp, greedy

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

To Hack or not to Hack

brute force, dp, greedy

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Finding the Vertex

brute force, dfs and similar, dp, interactive, trees

Clever Fat Rat

dp

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Willy-nilly, Crack, Into Release!

data structures, dp

Viruses

*special problem, dp, shortest paths, string suffix structures

Colored Jenga

dfs and similar, dp, probabilities

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Balanced Distribution

data structures, dp, greedy

Hex Dyslexia

bitmasks, brute force, dp, graphs

Again Counting Arrays (Easy Version)

combinatorics, dp, fft, math

Mark and Spaceship

brute force, dp

Vasily the Bear and Painting Square

bitmasks, combinatorics, dp, implementation

Card Pairing

dp, greedy, hashing, implementation

Tenzing and Necklace

divide and conquer, dp, greedy

Slime and Sequences (Hard Version)

dp, fft, math

BubbleReactor

dp, graphs

AquaMoon and Potatoes

brute force, data structures, dp

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

An easy problem about trees

dp, games, greedy, trees

Composing Of String

*special problem, dp

Panda Meetups

data structures, dp, flows

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Hard Optimization

dp

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Assigning Fares

dp, trees

Tokitsukaze and Gems

dp, math

Slime and Hats

constructive algorithms, dp, greedy

Grove

brute force, dfs and similar, dp, geometry, probabilities

Math, math everywhere

brute force, dp, math, meet-in-the-middle, number theory